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Renasant Corporation (Parent Company Only) Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 44,420 | $ 31,964 | $ 36,710 | $ 33,826 | $ 16,511 | $ 26,421 | $ 25,284 | $ 23,972 | $ 146,920 | $ 92,188 | $ 90,930
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Gain on sale of securities |  |  |  |  |  |  |  |  | 16 | (148) | (1,186)
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | 44,044 | (6,620) | 10,136
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  | (41,954) | (12,572) | (16,694)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 77,406 | 201,561 | 163,797
Investing activities |  |  |  |  |  |  |  |  |  |  |
Net cash (paid) received in acquisition |  |  |  |  |  |  |  |  | 153,502 | 41,685 | 25,263
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (498,581) | 75,142 | (351,993)
Financing activities |  |  |  |  |  |  |  |  |  |  |
Cash paid for dividends |  |  |  |  |  |  |  |  | (43,614) | (34,416) | (29,734)
Cash received on exercise of stock-based compensation |  |  |  |  |  |  |  |  | 201 | 173 | 415
Excess tax benefits from exercise of stock options |  |  |  |  |  |  |  |  | 0 | 0 | 2,771
Repurchase of shares in connection with stock repurchase program |  |  |  |  |  |  |  |  | (7,062) | 0 | 0
Repayment of long-term debt |  |  |  |  |  |  |  |  | (849) | (170,240) | (47,230)
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 98,385
Proceeds from equity offering |  |  |  |  |  |  |  |  | 0 | 0 | 84,105
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 708,833 | (301,474) | 282,849
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 287,658 | (24,771) | 94,653
Cash and cash equivalents at beginning of year |  |  |  | 281,453 |  |  |  | 306,224 | 281,453 | 306,224 | 211,571
Cash and cash equivalents at end of year | 569,111 |  |  |  | 281,453 |  |  |  | 569,111 | 281,453 | 306,224
Renasant Corporation |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 146,920 | 92,188 | 90,930
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Gain on sale of securities |  |  |  |  |  |  |  |  | 0 | 0 | (1,186)
Equity in undistributed net income of bank subsidiary |  |  |  |  |  |  |  |  | (103,619) | (65,970) | (65,591)
Amortization/depreciation/accretion |  |  |  |  |  |  |  |  | 160 | 656 | 560
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | 3,381 | (1,069) | (556)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  | (171) | (2,291) | 564
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 46,671 | 23,514 | 24,721
Investing activities |  |  |  |  |  |  |  |  |  |  |
Purchases of securities held to maturity and available for sale |  |  |  |  |  |  |  |  | 0 | 0 | (1,380)
Sales and maturities of securities held to maturity and available for sale |  |  |  |  |  |  |  |  | 1,052 | 1,555 | 6,101
Investment in subsidiaries |  |  |  |  |  |  |  |  | 0 | (25,000) | (75,000)
Net cash (paid) received in acquisition |  |  |  |  |  |  |  |  | (34,836) | 4,834 | 0
Other investing activities |  |  |  |  |  |  |  |  | 423 | (54) | 0
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (33,361) | (18,665) | (70,279)
Financing activities |  |  |  |  |  |  |  |  |  |  |
Cash paid for dividends |  |  |  |  |  |  |  |  | (43,614) | (34,416) | (29,734)
Cash received on exercise of stock-based compensation |  |  |  |  |  |  |  |  | 201 | 173 | 415
Excess tax benefits from exercise of stock options |  |  |  |  |  |  |  |  | 0 | 0 | 2,771
Repurchase of shares in connection with stock repurchase program |  |  |  |  |  |  |  |  | (7,062) | 0 | 0
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | (10,310) | 0
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 98,127
Proceeds from equity offering |  |  |  |  |  |  |  |  | 0 | 0 | 84,105
Other financing activities |  |  |  |  |  |  |  |  | (93) | 310 | 0
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (50,568) | (44,243) | 155,684
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (37,258) | (39,394) | 110,126
Cash and cash equivalents at beginning of year |  |  |  | $ 81,839 |  |  |  | $ 121,233 | 81,839 | 121,233 | 11,107
Cash and cash equivalents at end of year | $ 44,581 |  |  |  | $ 81,839 |  |  |  | $ 44,581 | $ 81,839 | $ 121,233

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |